How do I add an image in the drawable folder to an ImageView in Android Studio 1.2?

Since Google added the mipmap folder for the launcher icons, I have had issues using the drawables folder. I manually added the hdpi folders in the drawable folder, but when I try and add the src path, the images won't allow me to view and select them. How do I add an image in the drawable folder to an ImageView in Android Studio 1.2?